Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin
Prestack depth-migrated seismic reflection data collected off Flemish Cap on the Newfoundland margin show a structure of abruptly thinning continental crust that leads into an oceanic accretion system. Within continental crust, there is no clear evidence for detachment surfaces analogous to the S re...
Published in: | Geology |
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GSA, Geological Society of America
2004
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Online Access: | https://oceanrep.geomar.de/id/eprint/343/ https://oceanrep.geomar.de/id/eprint/343/1/534_Funck_2004_ContinentalBreakupAndTheOnset_Artzeit_pubid11559.pdf https://doi.org/10.1130/G19694.1 |
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ftoceanrep:oai:oceanrep.geomar.de:343 2024-09-30T14:38:50+00:00 Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin Hopper, John R. Funck, Thomas Tucholke, Brian E. Larsen, Hans Christian Holbrook, W. Steven Louden, Keith E. Shillington, Donna Lau, Helen 2004 text https://oceanrep.geomar.de/id/eprint/343/ https://oceanrep.geomar.de/id/eprint/343/1/534_Funck_2004_ContinentalBreakupAndTheOnset_Artzeit_pubid11559.pdf https://doi.org/10.1130/G19694.1 en eng GSA, Geological Society of America https://oceanrep.geomar.de/id/eprint/343/1/534_Funck_2004_ContinentalBreakupAndTheOnset_Artzeit_pubid11559.pdf Hopper, J. R., Funck, T., Tucholke, B. E., Larsen, H. C., Holbrook, W. S., Louden, K. E., Shillington, D. and Lau, H. (2004) Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin. Geology, 32 (1). pp. 93-96. DOI 10.1130/G19694.1 <https://doi.org/10.1130/G19694.1>. doi:10.1130/G19694.1 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2004 ftoceanrep https://doi.org/10.1130/G19694.1 2024-09-04T05:04:40Z Prestack depth-migrated seismic reflection data collected off Flemish Cap on the Newfoundland margin show a structure of abruptly thinning continental crust that leads into an oceanic accretion system. Within continental crust, there is no clear evidence for detachment surfaces analogous to the S reflection off the conjugate Galicia Bank margin, demonstrating a first-order asymmetry in final rift development. Anomalously thin (3–4 km), magmatically produced oceanic crust abuts very thin continental crust and is highly tectonized. This indicates that initial accretion of the oceanic crust was in a magma-limited setting similar to present-day ultraslow spreading environments. Seaward, oceanic crust thins to <1.3 km and exhibits an unusual, highly reflective layering. We propose that a period of magma starvation led to exhumation of mantle in an oceanic core complex that was subsequently buried by deep-marine sheet flows to form this layering. Subsequent seafloor spreading formed normal, ∼6-km-thick oceanic crust. This interpretation implies large fluctuations in the available melt supply during the early stages of seafloor spreading before a more typical slow-spreading system was established. Article in Journal/Newspaper Newfoundland OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Geology 32 1 93 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Prestack depth-migrated seismic reflection data collected off Flemish Cap on the Newfoundland margin show a structure of abruptly thinning continental crust that leads into an oceanic accretion system. Within continental crust, there is no clear evidence for detachment surfaces analogous to the S reflection off the conjugate Galicia Bank margin, demonstrating a first-order asymmetry in final rift development. Anomalously thin (3–4 km), magmatically produced oceanic crust abuts very thin continental crust and is highly tectonized. This indicates that initial accretion of the oceanic crust was in a magma-limited setting similar to present-day ultraslow spreading environments. Seaward, oceanic crust thins to <1.3 km and exhibits an unusual, highly reflective layering. We propose that a period of magma starvation led to exhumation of mantle in an oceanic core complex that was subsequently buried by deep-marine sheet flows to form this layering. Subsequent seafloor spreading formed normal, ∼6-km-thick oceanic crust. This interpretation implies large fluctuations in the available melt supply during the early stages of seafloor spreading before a more typical slow-spreading system was established. |
format |
Article in Journal/Newspaper |
author |
Hopper, John R. Funck, Thomas Tucholke, Brian E. Larsen, Hans Christian Holbrook, W. Steven Louden, Keith E. Shillington, Donna Lau, Helen |
spellingShingle |
Hopper, John R. Funck, Thomas Tucholke, Brian E. Larsen, Hans Christian Holbrook, W. Steven Louden, Keith E. Shillington, Donna Lau, Helen Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin |
author_facet |
Hopper, John R. Funck, Thomas Tucholke, Brian E. Larsen, Hans Christian Holbrook, W. Steven Louden, Keith E. Shillington, Donna Lau, Helen |
author_sort |
Hopper, John R. |
title |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin |
title_short |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin |
title_full |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin |
title_fullStr |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin |
title_full_unstemmed |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin |
title_sort |
continental breakup and the onset of ultra-slow seafloor spreading off flemish cap on the newfoundland rifted margin |
publisher |
GSA, Geological Society of America |
publishDate |
2004 |
url |
https://oceanrep.geomar.de/id/eprint/343/ https://oceanrep.geomar.de/id/eprint/343/1/534_Funck_2004_ContinentalBreakupAndTheOnset_Artzeit_pubid11559.pdf https://doi.org/10.1130/G19694.1 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
https://oceanrep.geomar.de/id/eprint/343/1/534_Funck_2004_ContinentalBreakupAndTheOnset_Artzeit_pubid11559.pdf Hopper, J. R., Funck, T., Tucholke, B. E., Larsen, H. C., Holbrook, W. S., Louden, K. E., Shillington, D. and Lau, H. (2004) Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland rifted margin. Geology, 32 (1). pp. 93-96. DOI 10.1130/G19694.1 <https://doi.org/10.1130/G19694.1>. doi:10.1130/G19694.1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G19694.1 |
container_title |
Geology |
container_volume |
32 |
container_issue |
1 |
container_start_page |
93 |
_version_ |
1811641435735195648 |